Low Density polyethylene is an older resin used mainly in lower end utility liners. It has been replaced by linear low polyethylene. It is still very appropriate in applications where clarity of film is the most important characteristic. Primary applications are garment film, bread bags, and other food applications.
Linear low-density polyethylene (often called Linear) is a second-generation film resin developed in the 1970s. The 1974 and 1979 energy shortage created a demand for newer, stronger resins that could perform as well as the other, low density ones, but use less material. The basic idea is that, if you start with a stronger plastic, you can make the bags thinner and less expensive. This is accomplished because less material is used in the bag for the same application. Low-density resin can usually only be drawn down to .8 mil to have any strength characteristics. Linear Low-Density liners can be made as thin as .4 mil and still carry in excess of five pounds of waste. This resin is very puncture and tear resistant. Those properties are outstanding where additional stretch is required in applications handling sharp or pointed edges. Within this category, there are several popular formulations all with distinct characteristics offering advantages and disadvantages. The formulations are Butene, Hexene, Octene, and Super Hexene.
High molecular weight polyethylene High Density Polyethylene, High Molecular Weight (often called High Density, HD, or HMW) was developed to continue the trend of producing efficient thinner bags for the marketplace. The market place began to see high-density bags when it began to replace brown paper bags in the 1980s. Products made from HMW resin use the least amount of materials when compared to alternatives—paper or other plastic resins. Since high-density bags occupy the least amount of space, they are the product of choice when the primary concern is restricted storage or landfill space. Flexsol recognizes the growing focus on environmental concerns and the continued need to supply high performance, economical products. We manufacture a complete line of HMW high-density liners. Our experience manufacturing thin gauge film ( as thin as .23) gives us an advantage over many competitors who only manufacture high-density liners on larger sizes and heavier gauges.
Post-Consumer polyethylene and Recycled-Industrial polyethylene also referred to as PCR is recycled plastic. PCR differs from recycled-industrial material in that it was used by the consumer before going through the recycling process. PCR resin can contain a blend of many things including milk bottles, and bags of different polyethylene resins. PCR source materials are usually of mixed colors. A clear bag may have a tint of color when PCR is added to the raw material blend. One thing to keep in mind is that the performance characteristics are degraded when PCR is blended with other materials.
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